Add armv6h->armv6l architecture mapping for Raspberry Pis running Arch Linux ARM

It seems Arch Linux ARM on the Raspberry Pi reports the architecture as armv6h, where Zero Install works with armv6l for the same hardware. From what I can tell the 'h' indicates hard-float support.

I unfortunately lack the compilation environment to actually deploy this to my pi for testing, but I followed the source, and this does seem like the correct place for this mapping.

As an example what effect this has, I can't install 0repo because of errors such as these:

          package:arch:python:3.4.1-1:armv6h (3.4.1-1): Not compatibile with the requested CPU type

(Note: the error message actually says "compatibile".)